根据煤系有机质碳同位素分布受控于沉积环境及其相应生物生产力变化这一理论假设，应用气相色谱／碳同位素比值质谱技术，对比研究了煤系沉积中煤和煤系页岩可溶有机质分子碳同位素分布特征，结果显示煤较煤系页岩更富集重碳同位素，据此提出了判识煤和煤系页岩生油的分子碳同位素地球化学方法，并成功应用于吐鲁番盆地煤成油对比． Based on the theoretical hypothesis that the distribution of carbon isotopes of coal-based organic matter is controlled by sedimentary environment and its corresponding biological productivity, the relationship between coal-based coal shale dissolved organic matter and carbon isotope ratio mass spectrometry The results show that coal is more enriched in heavy carbon isotopes than coal-based shale. Based on this, a molecular carbon isotope geochemical method for coal-derived shale oil production is proposed and successfully applied to Turpan Basin coal Oil contrast.